用三体计算研究I=1/2，J^P=1/2^+的K反K-N分子态
K anti-K N molecule state with I=1/2 and J^P=1/2^+ studied with three-body calculation
摘要：
采用非相对论性三体计算方法，利用有效\bar KN，K \bar K和KN相互作用，研究了I=1/2，J^P=1/2^+的K \bar{K} N系统. \bar K-N相互作用将λ（1405）描述为\bar K-N分子，而K-\bar K相互作用被调整以给出作为K-\bar K分子的f_0（980）和a_0（980）态。研究表明，在低于K \bar KN阈值（1930 MeV）的情况下，可以形成一个束缚态K \bar KN，其三重强子衰变宽度为90 ~ 100 MeV，主要衰变过程为K bar KN-> K pi Sigma和pi eta N.结果表明，\bar-KN态是一个弱束缚的强子分子态，由于存在排斥的KN相互作用，它的尺寸大于α粒子.
英文摘要：
A K \bar{K} N system with I=1/2 and J^P=1/2^+ is investigated with non-relativistic three-body calculations by using effective \bar K N, K \bar K and KN interactions. The \bar K N interaction describes the Lambda(1405) as a \bar K N molecule, and the K\bar K interaction is adjusted to give f_0(980) and a_0(980) states as K \bar K molecules. The present investigation suggests that a bound K \bar K N state can be formed below the K \bar K N threshold (1930 MeV) with a 90 ~ 100 MeV width of three-hadron decays, which are dominated by K bar K N -> K pi Sigma and pi eta N. It is found that the K \bar K N state is a weakly bound hadron molecular state with a size larger than an alpha particle because of the repulsive KN interactions.
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